44.6.8 Configuring the Operational Amplifiers

Each individual operational amplifier is configured by its respective Operational Amplifier Control x register (OPAMPCTRLx). These settings must be configured before the amplifier is started.

• Select the positive input in OPAMPCTRLx.MUXPOS
• Select the negative input in OPAMPCTRLx.MUXNEG
• Select RES1EN if resistor ladder is used
• Select the input for the resistor ladder in OPAMPCTRLx.RES1MUX
• Select the potentiometer selection of the resistor ladder in OPAMPCTRLx.POTMUX
• Select the VCC input for the resistor ladder in OPAMPCTRLx.RES2VCC
• Connect the operational amplifier output to the resistor ladder using OPAMPCTRLx.RES2OUT
• Select the trade-off between speed and energy consumption in OPAMPCTRLx.BIAS
• Select RES3TAP as positive input for the OPAMP2 and connect the resistor ladder to OA0OUT by setting the RESCTRL.RES2OUT bit only if OPAMPs are configured as a High Gain Instrumentation Amplifier